What is the difference between Emil Fisher’s lock-and-key model and Daniel Koshland’s induced fit model? What is the current model like?

Factors that affect enzyme action

Knowing what you know about the nature of enzymes, predict how the following factors affect enzyme function:

Factors Effect on reaction rate if factor is reduced/decreased Effect on reaction rate if factor is raised/increased Brief explanation as to why these factors affect enzyme function and reaction rates in that way